导航菜单

有刷、有感和无刷无感电机的使用心得

First, the principle of brush motor

To clarify this issue, you should have a rough understanding of how the brush motor works. Next, a three-electrode, two-pole inner rotor brushed motor was used as a demonstration.

3932d57e60e84c0fae4a9baa37da4436

Second, the working principle of brushless motor

First of all, the brushless motor is not a DC motor. Although the model is powered by a DC battery, it is converted to three polarities by three-phase alternating current after brushless ESC. As can be seen from the figure below, the brushless motor has no carbon brush. In contrast to the brush, the magnet of the brushless motor becomes the rotor~

9def1409a6ca4d699b0c9b41f6800f7c

Third, the name of the brushless motor

Compared with the brush motor, the name of the brushless motor is well understood. Generally, it consists of four numbers, such as a 2040 brushless motor. This figure only represents the external dimensions of the motor. 2040 represents a motor with a diameter of 20 mm and a length of 40 mm. Similarly, the 3650 brushless motor indicates that the motor has a diameter of 36 mm and a length of 50 mm.

In fact, the size of the 370 brush motor is the same as that of the 2530 brushless motor. The size of the 540 motor is the same as that of the 3650 brushless motor.

Fourth, the characteristics of brushless motor

1. There is no carbon brush. In theory, the rotor does not need to have a link with the outside world.

2. During the running process, the speed of the brushless motor is determined by the frequency of the alternating current, so the higher the frequency, the faster the brushless motor can turn.

3. The speed of the brushless motor is set strictly according to the KV value. 1000KV means that the speed of each Ford motor is 1000 rpm. Therefore, when the voltage is 5V, the 1000kv brushless motor rotates at 5000rpm.

xx4.在运行过程中,同一速度电机的转矩由ESC输出的电流强度决定。电流越大,扭矩越大。 (理想情况下,我们的“智能”无刷电调将不断“监控”我们的电机是否需要更大的扭矩,并且还能确保不留下扭矩,以免浪费表达)

5.外转子和内转子无刷电机

上述无刷电动机的工作原理是内转子无刷电动机。顾名思义,磁铁在里面。另一方面,外转子无刷电动机的磁体“外包”。 A,B和C电极在里面。这种设计允许电动机具有更高的扭矩,但速度不会上升。该模型中,普通外转子无刷电机的KV值小于2000,而内转子无刷电机的KV值可达8000-9000kv。因此,普通的外转子无刷电动机通常用在飞机上,而模型车和模型船通常使用内转子无刷电动机。

第六,没有刷子,没有感觉没有刷子

要解释这个问题,首先要了解感受感,并且觉得没有刷牙感指的是“霍尔传感器”,那么什么是“霍尔”?霍尔指的是1879年美国物理学家霍尔(A.H. Hall,1855-1938)在研究金属导电机制时发现的霍尔效应。当电流垂直于通过导体的外部磁场时,在导体的两个端面之间产生垂直于磁场方向和电流的电位差。这种现象是霍尔效应。这种电位差也称为霍尔电位差。

So why do we want to sense this stuff? To clarify this problem, we must start with a shortcoming of feeling no brush. Just said that the speed of the brushless motor is determined by the frequency of the alternating current, then the ESC should try to figure out the current motor speed and the current state of the motor. In fact, this is very easy for a motor that is already running normally, but it is more troublesome for a motor that has just started or is running very slowly (it is difficult to accurately measure the state of the motor speed), so there is no feeling. The brush motor will not be linear or even tremble at low speeds, and the starting torque will not be stronger than the same level brush motor.

However, it has been found that the Hall effect of any brushless motor is obvious, so it is easy to know the operating state of the high-speed or low-speed motor through the Hall effect ESC, thus solving the problemless brushless motor. The fault of the motor! But for the time being, Hall sensors are not cheap goods, so the price of brushless motors and ESCs is much more expensive than non-sense.

Seven, common models with brush, no sense of no brush, sense of brushless motor comparison

Brushed motor, no feeling, no brush, no brush, no brush

Conversion efficiency: low high

Motor output power: low high

Starting torque: good, generally good

Medium and high speed torque: generally good

Low speed linearity: better generally good

Medium and high speed linearity: Good Good

The highest speed (generally 540 motor): common 20,000 common 50,000 common 50,000

Easy to wear: Easy to wear, not easy to wear, not easy to wear

Motor price (540) Mid-range 100RMB Minimum 120RMB Minimum 200RMB

ESC price (540) Mid-range average 120 or so Minimum 200RMB Minimum 300RMB

xx